SensorManager.registerListener (.., Handler handler), example please?

Question

I don\'t understand how to use this method,

sensorManager.registerListener(SensorEventListener listener, Sensor sensor, int rate, Handler handler);

(Documentati

Answer 1

Here you have an example:

SensorManager mSensorMgr = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);

HandlerThread mHandlerThread = new HandlerThread("sensorThread");

mHandlerThread.start();

Handler handler = new Handler(mHandlerThread.getLooper());

mSensorMgr.registerListener(this, mSensorMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
                    SensorManager.SENSOR_DELAY_FASTEST, handler);

From the source code of android SensorManager's class you can see that the registerListener() extract the Looper of your Handler to create a new handler with this looper where it call the onSensorChanged method.

If you don't pass your handler,the SensorManager will use the main application thread.